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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Endocrinol+Metab
2014 ; 307
(7
): E571-9
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Vasodilator-stimulated phosphoprotein protects against vascular inflammation and
insulin resistance
#MMPMID25117404
Cheng AM
; Rizzo-DeLeon N
; Wilson CL
; Lee WJ
; Tateya S
; Clowes AW
; Schwartz MW
; Kim F
Am J Physiol Endocrinol Metab
2014[Oct]; 307
(7
): E571-9
PMID25117404
show ga
Among the pleotropic effects of endothelial nitric oxide (NO) is protection
against vascular inflammation during high-fat diet (HFD) feeding. The current
work investigated the role of the enzyme vasodilatory-stimulated phosphoprotein
(VASP) as a downstream mediator of the anti-inflammatory effect of NO signaling
in vascular tissue. Relative to mice fed a low-fat diet (LFD), levels of VASP
Ser(239) phosphorylation, a marker of VASP activation, were dramatically reduced
in aortic tissue of mice with obesity induced by consuming a HFD. As reported
previously, the effect of the HFD was associated with increased aortic
inflammation, as measured by increased NF-?B-dependent gene expression, and
reduced vascular insulin sensitivity (including insulin-stimulated
phosphorylation of eNOS and Akt). These effects of the HFD were recapitulated by
VASP knockout, implying a physiological role for VASP to constrain inflammatory
signaling and thereby maintain vascular insulin sensitivity. Conversely,
overexpression of VASP in endothelial cells blocked inflammation and insulin
resistance induced by palmitate. The finding that transplantation of bone marrow
from VASP-deficient donors into normal recipients does not recapitulate the
vascular effects of whole body VASP deficiency suggests that the protective
effects of this enzyme are not mediated in immune or other bone marrow-derived
cells. These studies implicate VASP as a downstream mediator of the NO/cGMP
pathway that is both necessary and sufficient to protect against vascular
inflammation and insulin resistance. As such, this work identifies VASP as a
potential therapeutic target in the treatment of obesity-related vascular
dysfunction.